Maxim Integrated Teridian V.22 bis Linux Softmodem for 73M1822/73M1922 MicroDAA - Manual (Page 45)

UG_1x22_043 V.22 bis Linux Softmodem for 73M1x22 MicroDAA User Guide
Rev. 1.5 45
Bit 1 1 Enables On-Hook Line-In-Use Voltage sensing detection (LIU-V)
Bit 2 1 Enables On-Hook Line-In-Use Energy sensing detection (LIU-E)
Bit 3 1
Enables Call-Waiting Caller-ID option. This bit applies only to Off-
Hook/Online/Type II Caller-ID.
 Bit 4 1 Enables high impedance TXAN/TXAP while looking for CID
 Bit 5 1 Enables receive gain (20 dB) while looking for CID

Bit 6 1
Enables using USER10 output to signal DAA to activate on-hook LIU
sensing
Bit 7 1 Enables Long Space Disconnect. When enabled, the TSC
Softmodem sends 3.5 seconds of NULL characters before
disconnecting upon reception of an on hook command from the host;
and disconnects upon reception of 1.5 second of NULL characters
from the remote modem.
S111
Line-In-Use Settling time
n 0 –254 in 10ms unit
 20 200ms
This register sets the settling time to wait, after the LIU sensing circuit is enabled, before
sampling LIU signal. This is used for both on-hook (Voltage sensing LIU) and off-hook
(PPU) detection.
S112
Line-In-Use Energy detection Wait
n 0 –254 in 100ms units
 20 2 seconds
This register sets the qualify time that Energy must remain below threshold.
S113 Line-In-Use Energy Detection Threshold
n 0 – 95
 60 Default value.
Sets the Threshold for the voice Energy. Lower number means higher signal threshold.
The value of 0 would effectively never detect and higher than 95 would always detect. This
register is also use by (J7) test mode as a minimum carrier detect threshold.